Big news today - X-Cart 4.3 was released:

http://www.x-cart.com/news/xcart-430-released.html

This represents a pretty big change from the 4.1 platform, and as soon as we have done some testing and let the bugs work themselves out we'll be switching to this platform for all new installs. Looks like they did a nice job on first glance though. If you are starting a new site in the next few weeks, I'd hold out for at least another release - the early ones usually have a few bugs that need to get fixed before it can be used for a live site, although they did a pretty good job with beta on this one.

Will post an update here once we have had a chance to play around with it a bit more.